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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928b5edc9a19fa4de1bf30937a3c94f224510dc6018c30707bb09546d790726a' 
  AND token = 'sCCS8GFLxL93DStR1G6RT5D+dStZI7pa+0fxyAJ6yH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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