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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a90b2df6abee4a0f0f60bb83943d7c14915f4de3e8b408b03d168b9dcad4a3a' 
  AND token = '3voNZvUT7icaE9uIyC/LOXSdZ/Ne1CKpkDABvolHl7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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