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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf297a6e91cc93f5eb97adfd051911bcf8034d908746be1b99409fbecd8bf7a' 
  AND token = '/Mo91yDBdxtSXASUkQ6G/aKY1n2aMQPUSmOGI2hElXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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