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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1cff7ec8c18f7a1e60e1926d863695540f9af54186fbc01b9a6079d7ba5920' 
  AND token = 'WHn+Jtdp7RNAq832Q0QHHRZR1qErWKs2l0EPyii+lss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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