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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61fd783ae9d790bfb9f70c8f6a0bab55ac4f45331414ce4cbddd4a5c7bb7226' 
  AND token = '6GHkHrDKQanDu8DvYWJ252VSpJUKSUM/rxyMW5DBbXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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