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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c377eca3c3c6aae77771af16d829bf8d43fb28f9efd7567edefdd98a9abcd2be' 
  AND token = '0pZB/9GBHMov9YietCJUSfXncUf34TY47NaiOxicLzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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