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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1553d75672c93b40363e643a4faba2a874b4b90ec85d99c55d37146f3dd108a2' 
  AND token = '2JBVpwgQh5TN51amYAsE0uYlERJAthF8XZt5cFEEtTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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