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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8be8cf94ee8393295f8c73fd3809d4e9b70c76d987ef24ec80143fef3e8102' 
  AND token = 'iD0W9Y96NxV46letb7wvi9D7td5u0eIw8B5O+0282aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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