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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a86f47cd7f1d40464c8c54b07762c7d779ffaec661217cd2f5e88194ee286d6' 
  AND token = 'gaYq3390TPZtSoGjgGluG+LAdhL1gkLQfrj1QUgMvUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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