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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccccf048564c04eef8cb4071d12428e8a6296874848aa50d2d0567f3a0f66f68' 
  AND token = 'ZUIkL0+R9k5sr+1nN4U6wfhHjAqVeQQSk0pTZBq8yQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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