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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47f9a2576e97595a0882c6f4202437e7a907aa71dc0c0948a9b3b03299a31cb' 
  AND token = 'uXlIsVfV5gn05X5lGJYjNZFPedYPN8OEn6NHq95ehY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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