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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c6524c6a2824c232924c9836998badf3adc8a00a3186c30968494ade64a8fa' 
  AND token = 'yS2TT0XFdDoXL7qlXa0gqqk4ru0MzuNHd9l7CNcF6W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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