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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c428ba8574f9294c98bd8e59444caa204298c913a34c363fb104901c81a7823' 
  AND token = '4NkhoJyqJTQxOPGjff5/AghiG74AXolwiIT9fLnN5Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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