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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb92000a9c32d6434df0f0ff68cf863e69b54f5179cf675312c7c26b757936e' 
  AND token = '6+iEZpZOmH/BH6iFqmv68A+i9AHAZkamxfl9gSpI/Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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