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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36b2f1d19e9e6ff454f4e3b8bab08adecd9b15bcda1aadc1aa63ea6d7f15d50' 
  AND token = '6DorAVEQEfv3dp9M+hvtyHQwcZx4R9ziuODciea/4iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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