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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb9804d464f592b3cfaff9595467c30265d8068ed4cf9459b6a50edb5547641' 
  AND token = 'd27MulDt7ab6eYvZIgYIp/ectA0i0/vl6iz+WlhqRvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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