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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58552f7b0df959f395783adc31527ff948c57d8528ed2c1e88ea8b5238e0b090' 
  AND token = '/ZGjp4DEy7Pxe4Y6FRdgAu5yxNuE5o7lMM7BHawxxvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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