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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf83cf685a676fac3320b04fa158c246f659d54c649c09ed7267b9f385860062' 
  AND token = 'uD2r4frorhUeRPZsPt0B3GV1BmJ3D72NhRj2F34NVA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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