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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34c21c48c2d9540f9a33feb221f7a4169ba69e6ebeb0e77471d0d5bdf5036b5' 
  AND token = 'xsEYCOvX4MQFg/wxTSq/W+cbRIudCWo5oD75X7Eq4bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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