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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bf0365a7d4845c40ee54cc6e65ebef31a89ae8372f1db71a2e987c99cf6ea4' 
  AND token = 'GnTYcXLnPOZLGffwsjA3qMG3ScyyQJcxN99ZjZO1dMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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