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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e036212c0d261feb9eee5a3e5bbf892892b4bd6d6f361829a00971688d84d9' 
  AND token = 'eWFKvkChClmcZ3tCZGXeOh0EiCEO3NOPQGOyak78wcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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