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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34103be1e56978d18fc7320b3bbd542bb7cc19e667257cc60e847a06a3f3f23e' 
  AND token = 'Qa9IybLu2+ywu+92B/TWMMpJmKbdIFPcP4HwmdbO79w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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