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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e947a672e69e908c5e61070bd58a8c858145d265d46d1bea8bc16595d4fdf416' 
  AND token = 'k5PtDByapp69P8+3JB2o0pimzyLtYXJH7W8Optcm/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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