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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2530a3cadabeb07dc8710cd2d510e4731c62adcf4871e7d373021ce39eb62e8' 
  AND token = '5Ha6R3BRVQsjLMd/DQORBM9Ien/shUTciZuyjlmICoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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