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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a2655e8ff94772a8d55e00fdaa0384ac34ef1e6d5d5e13289aa110ac8612e4' 
  AND token = 'He34ook++EEf572EfZdmGVgcWa/Z+ZDZdJGCBAVWQOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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