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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89e03d49a348523e42a0632788e4d1a65bd1617e804b04fb3dc6925fcd97828' 
  AND token = 'MHkn8gzdR9oBKjS2u2iVMUZrt/Ld9mtF7YD9TkBrvos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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