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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814e03808d5fb8c275827f4c748d94966aa6872d468493739a5a7b2490e07822' 
  AND token = 'TIlYQ4PVN/upfSMpuJwVfjbeX3O/ypY1X4ksYcL5HV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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