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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28026b1de90ed5de454cbda6bd93d91f097b09c00a04affdfb088577ffc59794' 
  AND token = 'UHkkSEavZd/NJ26ttlwyZQ8dE0fcL96eIJldsc0D/l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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