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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa23791a89e5801e289990807d7e7e14910883ff0c837e325b64ddfbffdcc59' 
  AND token = 'G3s2CQSr5v3c7634O5nFq0gzD0RNpBCMhx83G7LDMkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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