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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac23e17c0dc9d0f1e7cc9f1ac0837e891b193f21327e0108a1ea983df3534ec' 
  AND token = 'ZatGoA98LsCLhEzKQM+555RQJ26LThH2ihG7rCU7J7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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