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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97943c98419f59a1749d3d828aa4ad7e86c19caf6c3e394230d7cb74a7cc57a1' 
  AND token = 'gc3dLtd88VsLFFFWFW03YdmLV+cKLiUJU1BnY4eEHSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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