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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928c7c47c6a3e775a9897082cd19423d4f4bc8498f9daecf36c24d51b1fb6a51' 
  AND token = 'ouTwrUsrLbBFt7PJe+gkjke/Itv84uXzN6tXARP0cWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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