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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ba17c7809fb6121c4aff5697744423561a070effca8b68d4a3b79c3a169622' 
  AND token = 'IP7vesn8TLnnmMrmT4cimvf0W/M2LZKbodkQ5mIgJHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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