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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66a8117da2895610d7fc0ad5360fd5b574f7319664e225c766b84d3293b5ccc' 
  AND token = '9wcp0/nIAqAOdSlghTQaM6168hzwJKC1vCd6qFiQ5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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