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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9c93a4729562d655aae74e2bc7113f04dce7ad176168c83836d7ce2711c5ea' 
  AND token = 'X2USLJ0/Kdtr+TyJL1d0BfZV+ZaF2q2B+grKwZnhII0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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