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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b512e40b34b0d25366c1c8ee26e65d3ccf4985dfa055c5015734a0687bbe9e' 
  AND token = 'qufzpmaovDu8yPv5yIxS3rnpjFab6/hTNqcMwscJduY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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