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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae518c9395db6cf670c04839aba44f7349ea76139091e38b13adad5d111983b0' 
  AND token = 'br/75sO7NLvCfFxQi+jknGx/4paPwN+150U5mROux6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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