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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6e6e2f32b47872d4eb7376228523ecff7c25fda6d6c0c14cd0a4fbdbe45b62' 
  AND token = 'oic7KBL3zaF9RuqU07KctBjEaxS+Bh7E5DcI9Vx/hco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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