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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a395f74a038fa1cab3fee107f6bdd5262b1cd7002ac99aab919c0be62fd39ec' 
  AND token = '6UyN4O8EK9FEJU1SXqhyxzxeqMNLPP4JJ/23icJH6Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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