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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec01e182c69b77dd513d9cf3d8e1e4d5a88cff370e949d0d3d976fb6c4a8097' 
  AND token = 'q7S7NtdnHdhrJ7li78Lne3vJyQO+OpcM2OZtC+91V/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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