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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7629e03c8c67d76d6c7d60389a870394fe63edd1846058748e6706797a7c2be6' 
  AND token = 'jYVAEBxQO8BwCAf7rldN28B2nFbhJuHZZX2opp6MmMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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