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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7418096b859a1c8d9ffd474e0e18015700ee89e09861293651b563e53c3ca540' 
  AND token = 'Fuq0O8D6ato+dVa8BpRJH4HvReTM96I+ioQDUgnF5HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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