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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec32623baf9d0009a250a4db967256f1819f6a7c8fee2fcf02dd0f4bd1bf15e' 
  AND token = 'axf7GIYbbRANM/U6LVeeZnZkajzOqO/7rGdu6115KRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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