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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7be1a4353ba14bdfe293c79d45721bcb38edde34ae922e7eb8810bc5064f11' 
  AND token = 'WygBucIyw61TTxba/VgwnXqK3HY4HKGDWzUVnWL4Ptw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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