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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065304164c75df3bd6aa95d5379acfe18951108c3a112a8f0c0900b63d8aa946' 
  AND token = 'P2ifAP3xdxlW/aKhHJaDrAhgyaKQPACTsho70AO8Jc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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