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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08df41f2561743c4a186e42148c3f828d5980974f91a80ad83e845ed055c77ed' 
  AND token = 'bptZid/SbKxNun47MdOpTRV/BF4gzz99YzNQZfY0avY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}