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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a85f754793140fa33ba6483511fe082bf153bdee62f4cb05b70e6f17479b6c9' 
  AND token = 'sDI7p1NsDskUZygxRQKsdCIjj0KU2q63wAf0Xq6ARp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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