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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813e708db71a27184f28a77beb108052f318544fffc1ffd4530f9f5420afeb50' 
  AND token = 'SwK6FRQyqfilRoUMRWqsLr5vBaNF5iPurDO0EgMfl/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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