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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf3323cc2f5dcc5f431ad4d6f4e8a90b9f710daaacda46b5852e9b59a0b1c10' 
  AND token = 'bPqM6+4qRb7IMrXHNdiIYdIj6kNKmsIYxl3Z/H8bcIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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