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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc7ebccba48bcc6469271a601acbce1ffed963bf52b0e4a4f5191d7f5165352' 
  AND token = '+Ummx6Qz293BeEoHeyQErSlKG8IWo9y3AQG3pPDAqBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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