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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa29dbe7edc22918f13672d4f2b548d7d2db8dea90d29dca30a26f6fe8dd666c' 
  AND token = 'eAspwtTJUT43Zj1G/KNYqCUy2/1noVphwmuxBacE8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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