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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8008faf59280041b0032e0f52016b8cbbc1b2cbefeab0068e0d50ae48f90af' 
  AND token = 'K9NF2R+p2S9BH8E2PRtTeqBwmx1xEq+N141sVuOUDko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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