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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f756a26b5ec8c5e90d873815b0262707fb0648c4b105531de5b5acb38ae9f5' 
  AND token = 'Lr9X/RqQAN00BLbYgXFaYHEEcAQN8NZSZjem17/1c1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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