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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864ec578b5903d8cde7bc31e24beb94d9c200bc9148782832e7b3c475179b1fa' 
  AND token = 'i79Cz6EZNhmHMa4EY8P5g7cys4Fw6TRLO0XcsNDqRMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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