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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12792f8f8050bdad0d7b2e5bb38fe536f2e57b1d210690798b03d98e40f0407a' 
  AND token = 'Gf696YiqPZRJ+9XGRN3qmgDw9LpcX6dCJ664AClBn74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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