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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ee4094bf3184b7d20e55e1c862aeb55688fdfb2abaab3a7effbd7b31ea1a5b' 
  AND token = '5LRQDYRuO0VO5OUfhBuzMl5c1CuKyVr3RQIN4boYCto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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