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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac9985ce6474926473686d61741eb4ef3618ab9676b67ddfb45b3878f77e0e6' 
  AND token = '9dKTt3WdjILLnfNeYakuyFbP8APrN9c3W1DCTeTK0ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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