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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7372b52697a068b0d18b4882b341d13d1b4ab7f1dd0c67a5f5e8906039642c91' 
  AND token = '89D3oWoSuRwsmT0V3a0CsW7T7y5A0BahXgXW6JtYdfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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