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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964142ae1623583b59508f3b8679c9b63cb62f49f2d3eac6604fbc429d64f62d' 
  AND token = 'HkmYf2Fbp2MjcbImaALfBQmJ0cXwJgY6B83nNO1IelM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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