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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5ca0226c5a1f1066dfe60a68c48fe194e01d56f94b49ee4fa7ffc6ad159ba1' 
  AND token = '0BBMCmvM12aBGRPput9rizeuhKGZKM3iQu1S+URtNkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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