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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72cde3a555576c24f44b584a1d428c1c99e2c3b15e468b0ced22060621e9776' 
  AND token = 'abrMIqy4eLc7ehEXIEn0LypA7357FIKthgAudGcyfvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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