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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9f0acb477eaf52dc2aaa50bcad65308a1fe9665422bd042d4a6bf06d6b9498' 
  AND token = '4LECvWMZ50QOICATwBJ4LnU9rULbjcvRuvnmKsGbnJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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