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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b23002ad2bdf3541c1ca11af80e1ab20f1aee5fe566a7443a063843508c4cc' 
  AND token = 'jIPe7a0lNAmcGeEff9TxjJYlDq/A6qdC6e86EnlG2NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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