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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02158d8c319996d1c82667d56c23722ba7d6171ef713a194f9d0de84b29c02b9' 
  AND token = 'JfawlILxUGEZHqlRl8JnaQsxcom+FQ8sr6H66OPx1qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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