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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03eb9167f59a747dc2cb8594bf70ff8247a0fabba5e803cf627409098fa51e83' 
  AND token = 'Ixs9vrqi5UNMZgAulKkx2VLUPRG9IOb6hNAZskuhHes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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