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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d835778c555d9066cdd8854519f12a72dfd1967148d990bda56c19fbf108c83' 
  AND token = '8boBl8BtUBDJ5oW9gbzHfKqLHjJijowLMj1xL6JEpxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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