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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dbf2275a553e4b1069e4ec3d4e1a9f4a234a4f0d89a2d568f88f8672981d53' 
  AND token = 'SnmdvfeXEPRvoR1/r+ttYxRaIm+g5ykjdLLnWGeoU6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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