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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745f4ad852934374dc5e336aa4961ef523463afb64e96b3f5df05b5dffd07524' 
  AND token = 'dr6HaGnozLs/tpFxkEaUNawThvRTSP+/st7tJgJO+90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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