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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bb7367fbe2680280e4a658b593ffec4dbfd8d96cc7bd80ef0c25c2d30a8567' 
  AND token = 'BMHFdZyqv4X/BTfn4i2SelqR8hOrpb4M/G8ZPrPYsrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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