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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3264857b098261c610433395e5851d65536ea60723f00741679f5d6cf266c6b7' 
  AND token = '5Yyfqqsh5TTD+PPB4knFpHtcJSTimOx81UjQhwJnpew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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