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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd620233e43133e85627903f1ecd05dca48953580c2fd3439dd897128ce87e367' 
  AND token = '3FQsvQwZ2adaPsUvTrebc76QCf30AGZ3zJhu7ttT7V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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