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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad28ae336af04192c4bdc29988d5e0346df93c0ca0b01588c85658ddf2a6965' 
  AND token = 'XsTKEjVm5b3lXPTvQ0ULcU4n0/BAQEI5DSwZQhVq5Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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