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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc733931a9b0201997cf9672d5f01ff0fd8d1a5e1c3b608b4f8560ff0540ea2' 
  AND token = 'Pwoj2b6XSVioGPQO0ZhJ9fn/vZuBNUwCOoJsEUN57oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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