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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e74057f02c395d87a7a1b30542d7b2db3a6b709ac43fb381cf0f47300cc5118' 
  AND token = 'C5Esa4AACCcfnYT3mb4AKmrl4o2Na9InT4gsESzaNqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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