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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7581f2f6d62e83ed94f39e67ea77085f869bff8b40342409c5150658c4ecf2' 
  AND token = 'AAgOUWgF6vUXsUflTxivW1G0JMuqusgzPBkZacgvoM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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