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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a905e1333c34530176f157a23e0f66a1d193026b61eee323b1f63461b294f0' 
  AND token = 'ilLxTuLuf/txjHwDHfZWnWbXMMC3de4/452wTAazHt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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