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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4da26e2c5daadb5cc9c729f5b6bf87d128291309471d486c400e2a75132a8a6' 
  AND token = 'NSAHyhzV1yVcsY4RIgNx3nAs6lkyvqhfpIuJhISylps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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