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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47f14fd5cf09496a53f683649b81e37fb2c8608a035067304dceefb68cd7259' 
  AND token = 're0yqV8ytK25u0QHuPcpzQHoogL/DbA3r/ATzdW+oHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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